Bender EDS460 - Page 52

Operation
52
TGH1394en/05.2007
6.Converters
Converters are a major source of interference for the monitored system.
ON Channel is optimized for converters. Insulation fault lo-
cation takes longer in this subcircuit.
OFF Channel is not optimized for converters. Insulation
faults cannot be reliably detected in circuits containing
converters.
7.Alarm I(d)
If the residual current exceeds > 10 A (EDS460/490) bzw. > 1A (EDS461/
491), an alarm message is displayed (Alarm 1). This alarm message can
be deactivated.
ON Alarm when the residual current response value is ex-
ceeded.
OFF No alarm when the residual current response value is ex-
ceeded (for specific applications only).
8.Operating principle (EDS490/491 only)
The EDS490-D/-L resp. the EDS491-D/-L has an alarm relay for each
measuring channel. Set the operating principle for each relay.
N/O-T N/O operation. Relay switches in the event of an alarm
or a test.
N/C-T N/C operation. Relay switches in the event of an alarm
or a test.
N/O N/O operation. Relay only switches in the event of an
alarm.
N/C N/C operation. Relay only switches in the event of an
alarm.
If the relay settings only differ slightly, we recommend the
following procedure for the EDS490:
- first set all the relays (1…12) to the same value;
- then modify the settings of individual relays.